Shredding machine



R. E. BEVIS Aug. '20, 1929.

SHREDDING MACHINE Filed Jan. 18, 1928 2 SheetsSheet INVNTOR.

R. E. BEVIS Aug. 20, 1929.

SHREDDI'NG MACHI NE 2 Sheets-Sheet Flied Jan. 18, 1928 ATTORNEY nm 9% wPatented Aug. 20, 1929.

UNITED STATES REXFORD E. BEVIS, OF FRANKLIN, OHIO.

SHREDDING MACHINE.

Application filed January 18, 1928.

Serial No, 247,718.

This invention} relates to improvements in it passes between the cuttingdiscs, thus actshredding machine.

In the accompanying drawings, which serve for illustrating theinvention: Fig. 1 is a view in vertical section of the improvedshredding machine;

Fig. 2 is a plan view of the same; Fig. 3 is a view of the machine incross section;

Fig. 4 is a detail View of the shredders. Machines of the characten hereshown are commonly used for shredding sheet material, as paper, paperboard, fabrics, leather, etc.

The objects attained in the improved machine consist in the addition ofdevices for removing from the cutting and cleaning rings theaccumulation of wax, parafline, and other adhering substances containedin various kinds of the shredded material. The accumulation of suchsubstances on the shred ding mechanism, without means employed forremoving the same, as in the common practice, causes the shreddedmaterial to stick to the mechanism and thus to retard and generally tointerfere with normal operation and production of the machines. Inshredding stock containing a high percentage of adhering substances,practical reduction of the stock becomes impossible because of suchobstruction of the mechanism.

' The shredding machine, as shown in the drawings for illustrating theinvention, consists generally in a frame structure 1, 1n which oppositesets of cutting and cleaning rings 2,3 are suitably supported, thematerial being moved to the shredding mechanism over a feed table 4.These features of the machine, are substantially the same in arrangementand operation as in machines of this character in common use.

The upper and lower sets of discs 2 and cleaning rings 2 are so relatedone to the other that the edges of opposite discs 2 overlap foreflecting the cutting or shredding action on the stock as it is fedbetween the discs from table 4. The cleaning discs 3 are free fittingbetween cutting discs and have a floating, rolling movement over thestock as ing to prevent clogging of the stock between the cutting discs.This relative movement between the cutting discs and cleaning rings, dueto the contact between the lateral edges .of the rings with the adjacentfaces of the discs, also serves for preventing or minimizing theaccumulation of adhering substances from the stock on the cutting discs.

The improvements consist in a series of metal rolls 5678, as'here shown,supported on shafts 9101112, operable in bearings 13141516 in the mainframe structure of the machine. Roll 5 is driven from the shaft 17,which supports the upper set of cutting and cleaning rings 23, through agear connection 181920-21, roll 7 being driven from the same shaftthrough a similar gear connection 1822 2324. Lowerrolls 68 are driven inlike manner from shaft 25, which supports the lower set of cutting andcleaning rings 28, through gear connections 26-'2 72829 and 2630-31-32respectively. Shafts l7-25 are operably connected one with the other onthe opposite side of thefmachine by gears 33-34, the machine as a wholebeing 75 driven by any suitable connection to the source of power. Theintermediate sets of gears 19-20, 22-23, 2728 and 3031 are each,supported adjustably in elongated bearings 35 to compensate forvariations in the gear groups of which the respective sets form apart.

The cutting rings or discs 2 are keyed on shafts 1725 as indicated at 36the cleaning rings 3 being larger in diameter and ar- '85 rangedalternately with and floatingly between the cutting rings, thus theformer op erate eccentrica-lly to shafts 1725, and have a wiping actionover the side edges of the cutters, which acts, in the shredding ofstock free of adhesive substances, to prevent clogging of the mechanismby the shredded material. In shredding stock, however, coated with waxor paraffine, or containing other substances, which adhere to themechanism, the cuttersv and cleaning rings become clogged with anaccumulation of such substances and the shredded material which sticksto it, and accordingly interferes with the production, both in theoutput of the machine and in the quality of'the product produced.

The cleaning rolls 56-78, comprised inthe invention, act by contactingon opposite sides with each set of mechanisms 2-3 to prevent, or tominimize, the accumulation of adhesive substances in the shreddingmechanism, and thus to maintain normal production conditions of themachine.

The cleaning rings 3 have floating contact on their opposite sides withthe adjacent cutting discs 2, thus there is relative movement to theextent of the eccentricity of rings 3 between discs 2 and rings 3 intheir rolling contact with the cleaning rolls 5, 6, 7, 8 which causesthe lateral edges of rings 3 to traverse the faces of discs 2 in acutting or scraping action which breaks upand dislodge-s the formationof substances of the stock which adhere to discs 2, the accumulation of'whichotherwise interfers'with the normal functioning of the cuttingdiscs. The rolling action of discs 2 and rings 3 with rollers 5, 6, 7, 8also acts to prevent adhering of such substances to the peripheries ofrings 3 which are kept clean by the frictional action of the rollers.

In some cases, according to the character of the shredding stock, themachines are further provided with a series of air jets 37, connected toany suitable air pressure line, which act to blow the substancesdislodged or broken up by the cleaning rolls, fromthe mechanism, the aircurrents being directed, as shown, from opposite sides toward the centerof the machine.

While the mechanism for cleaning the shredding mechanism consists in thepreferred form, as herein shown anddescribed, in the rolls 56-78, Iclaim as my invention any suitable mechanism, as scrapers,

brushes, or other mechanical devices which may be substituted for therolls forperforming the same function, the improvement comprised in theinvention being the first, as far asI am aware, in any form applied on ashredding machine of this character.

- The cleaning rolls may be made ineither "brass or steel, or of anysuitable material. A

slight clearance (about .002") is provided between the peripheries ofthe rolls and the cutters. Roll 8, as here shown, is substantiallylarger than rolls 5--67 for accelerating the discharge of the shredded.product.

Having described my invention, I claim: 1. Shredding mechanism of thecharacter described including a plurality of rotatable cutters spacedone from another" axially, a plurality of rotatable cutters arrangedalternately between the aforesaid cutters, ec= centric to the axisthereof, and having floatfor removing adhering substances therefrom.

2. Shredding mechanism of the character described including a pluralityof rotatable cutters spaced one from another axially, a plurality ofrotatable cutters arranged alternately, between the aforesaid cutters,eccentric to the axis thereof, and having floating radial movement tothe extent of their eccentricity, in combination with a device coactingfrictionally with the peripheries of said cutters for removing adheringsubstances therefrom.

3. Shredding mechanism of the character described including a pluralityof rotatable cutters spaced one from another axially, a

plurality of rotatable cutters arranged alternately, between theaforesaid cutters, eccentric to the axis thereof, and having floatingradial movement to the extent of their eccentricity, in combination witha device coacting frictionally with the peripheries of said cutters forremoving adhering substances and means for directing air blasts uponsaid mechanism for blowing said dislodged substances therefrom.

4. Shredding mechanism of the character 5 described including aplurality of rotatable cutters, spaced one from another axially, aplurality of rotatable cutters arranged alternately between theaforesaid cutters, eccentric to the axis thereof, and having floatingradial movement to the extent of their eccentricity, in combination witha roll coacting' at a different speed with the peripher ies of saidcutters for removing adhering substances therefrom.

5. Shredding mechanism of the character described including a pluralitgof-rotatable cutters spaced one from anot er axially, a plurality ofrotatable cutters arranged alternately between the aforesaidcutters,'eccentric to the axis thereof, and having floating radialmovement to the extent of their eccentricity, in combination with 'aroll operably geared with said cutters at a different speed and coactingwith. the peripheries thereof for removing adhering substancestherefrom.

6. Shredding mechanism of the character described including a pluralityof rotatable cutters spaced one from another axially, a plurality ofrotatable cutters arranged alternately between the aforesaid cutters,eccentric to the axis thereof, and having floatlng radial movement tothe extent of their eccentricity, in combination with a roll coactingwith the peripheries of said cutters for effecting the radial movementof the floating cutters and removing adhering substances from thecutters.

7 Shredding mechanism of the character described including a pluralityof rotatable cutters spaced one from another axially, a plurality ofrotatable cutters of'larger diameter than the aforesaid cutters,arranged alternately therebetween, eccentric to the axis thereof, andhaving floating movement to the extent of their eccentricity, incombination with a roll coacting with the peripheries of the cutters foreffecting the floating movement of the eccentric cutters and removingadhering substances from the cut- 10 ters.

In testimony whereof, I aflix my signature.

REXFORD E. BEVIS.

